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中国农学通报

中国农学通报 ›› 2011, Vol. 27 ›› Issue (3): 107-111.

所属专题： 马铃薯

• 农学 农业基础科学 • 上一篇    下一篇

华南8号木薯光合特性对土壤水分响应的研究

左应梅 杨重法 唐建   

  • 收稿日期:2010-07-07 修回日期:2010-07-22 出版日期:2011-02-05 发布日期:2011-02-05
  • 基金资助:

    海南省重点学科建设项目（木薯干物质生产与分配的生理生态研究）

The Study of Photosynthesis Light Response to Soil Moisture of Cassava（Manihot esculenta Crantz.cv.M.South China 8）

  • Received:2010-07-07 Revised:2010-07-22 Online:2011-02-05 Published:2011-02-05

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摘要：

摘 要：为了探讨土壤水分对华南8号木薯（SC8）光合作用-光响应特性的影响，本研究在土壤相对含水量（SRWC）20%～80%范围，采用盆栽方式种植SC8。在不同SRWC下栽培约4周后，使用LI-6400光合作用测定仪，测量净光合速率（Pn）、气孔导度（Gs）和胞间CO2浓度（Ci）等参数。结果表明, 当SRWC＞50%时，Pmax、AQY、LCP、LSP随着SRWC的增加变化较小；而当SRWC＜50%时，Pmax、AQY、LSP随SRWC的减少呈明显的下降趋势；LCP随SRWC的减少呈明显的上升趋势。影响SC8光合作用的主要原因既有气孔因素又有非气孔因素，低光照时（PAR≤400μmol?m-2?s-1），影响光合作用的主要原因是气孔因素，而高光照时（PAR≥600μmol?m-2?s-1），影响光合作用的主要原因是非气孔因素，且气孔因素和非气孔因素对光合作用的限制作用均表现为低SRWC大于高SRWC。SC8进行光合作用适宜SRWC的低限临界值可能在50%附近。

关键词: 氮源, 氮源, 等鞭金藻, 生长, 影响, 氯化铵, 硝酸铵, 尿素

Abstract:

Abstract: In order to explore the photosynthesis light response to soil moisture of cassava South China 8 (SC8). We planted SC8 in pots with the range 20%～80% of soil relative water content (SRWC) . And measured the net photosynthetic rate (Pn) ,stomatal conductance (Gs) ,intercellular CO2 concentration (Ci) and several other parameters by employing LI-6400 portable photosynthesis system after planting about four weeks. The results showed that Pmax, AQY, LCPand LSP were little variation with the SRWC increased when the SRWC was more than 50%.The Pmax, AQY and LSP obviously decreased with the SRWC decreased when the SRWCwas less than 50%,but the LCP obviously increased with the SRWC decreased.The main effect on photosynthesis of SC8 both stomatal factors and non-stomatal factors. The dominant factor was stomatal when the light was low (PAR ≤ 400μmol ? m-2 ? s-1),but the non-stomatal factor was dominant factor when the light was high (PAR ≥ 600μmol ? m-2 ? s-1).The limitation function of stomatal and non- stomatal factors to photosynthesis was low SRWC rather than high SRWC.And the lower limit threshold value of appropriate SRWC for SC8’s photosynthesis probably was 50%.